He explained that the campaign, which included a lecture highlighting the dangers of tobacco and a test that showed the level of carbon monoxide and carboxyhaemoglobin in exhaled breath, was intended to raise employees' awareness about the dangers of smoking and to show them ways and places where they could seek help to quit.

One of the problems encountered in measuring oxyhaemoglobin, were the small errors arising from other pigments in the blood, including methaemoglobin, carboxyhaemoglobin and sulfhaemoglobin, as well as reduced haemoglobin.

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